The Use of Smoke Alarms and the different types. What you should know.

Smoke alarms save lives, prevent injuries, and minimize property damage by detecting and alerting residents to fires early in their development. The risk of dying from fires in homes without smoke alarms is twice as high as in homes that have working smoke alarms.

There are two main types of smoke alarms, and both detect all types of growing fires. Ionization alarms, which sell for about $5 for battery-operated models, respond faster to flaming fires, such as those involving paper or flammable liquids. Photoelectric alarms, which sell for about $20, respond faster to smoldering fires, such as those ignited by cigarettes in upholstered furniture, bedding materials, and mattresses. Dual ionization/photoelectric alarms are also available, and cost about $30.

To ensure that both smoldering and flaming fires are detected as quickly as possible, the best protection is to have both types of alarms installed, or dual ionization/photoelectric alarms.

Working smoke alarms should be installed on every level of the home, outside sleeping areas and inside bedrooms, per manufacturer’s specifications. Locate smoke alarms away from air vents or registers, and avoid other spaces with high airflow.

All smoke alarms must be kept free of dust and insects. Current manufacturers’ guidance is to test alarms weekly and clean them monthly to make sure they operate properly. If the unit is battery operated or has battery back-up, the batteries should be replaced at least once a year. In addition, experts say that the smoke alarm unit itself should be replaced every 10 years.

Never remove the batteries to disable a smoke alarm, even if you experience "nuisance" alarms, such as while cooking or showering. Fan the detector with a newspaper or towel to stop the alarm. Clean the smoke alarm according to the manufacturer's instructions, and if possible relocate it away from the kitchen or bathroom. Some smoke alarms have a silencing feature, so nuisance alarms can be stopped quickly and easily.

Evidence indicates that some children may not awaken from the sound of a smoke alarm. Parents should hold a fire drill during the night so they can assess their children’s ability to awaken and respond appropriately. If children, or any other family members, do not awaken to or hear the smoke alarm, the home escape plan should be adjusted accordingly to help get all family members out safely. NASFM is aware of certain types of alarms that project a recording of the parents’ voice or some other sound to which children may be more responsive than the traditional alarm.

For elderly people, those who have impaired hearing or those who have other disabilities that make the alarm difficult to hear, there are smoke alarms that use strobe lights and vibrators in addition to sound. Exploring alternative approaches such as these may make sense in those households.

Develop and regularly rehearse an escape plan with all members of your household, so that when the smoke alarm sounds, everyone will move to a safe location outside the home. For information on how to develop a home escape plan, see http://www.nfpa.org/assets/files/PDF/FPWgrid03.pdf